The sponsor and other in your organization are repeatedly requesting changes . When you try to implement some of the changes, you discover the current contract does not include a budget for evaluating changes . What should you do？

以下哪一条能最好地描述在信息有限的情况下做出的成本和时间估计？（）

长期合同是质量管理的重要方面，因为：()

To integrate approved scope changes, the PM should begin with:

在项目的末期，与卖方的合同还有尚未解决的索赔，项目经理()。